Piston-ring



F. F. BES'SINGERL PISTON RING.

APFLTCATION FILED JAN. 26, 1920.

1,371,0 Patented Mar. 8,1921.

FRANK F. BESSINGEBI. 0F WELLINGTON, QHIO.

Specification of Letters Patent.

I PISTON-RING.

Patented Mar. 8, 1921.

Application filed January 26, 1920. Serial No. 354,281.

Bnssrnonn, of Lorain. State of Ohio, have invented certain new and useful Improvements in Pistonliings, of which the following is a full, clear, and exact description.

The primary object of this invention is to produce a simple and efiicient piston ring which may be cheaply manufactured.

A. further object of the invention is to produce a pair of piston rings which are exact duplicates and when fitted together may be easily applied to the ordinary piston to form a packing ring which will prevent loss of compression and leakage of gas and yet will have considerable elasticity to conform to the bore of the cylinder.

Another object of the invention is to makea pair of piston rings which will not pull apart axially but will be locked together in use, thus preventing the accumulation of carbon. dirt. etc. between the rings which would tend to permanently separate them and make them leak gas.

in the accompanying drawings,

Figure l is a plan view of one of the rings 3 creases until eccentric. rib its inner periphery nearly 00-- .ckt

with the eccentric rib up.

Fig. 2 is a plan view of one of the rings with the rib down.

Figs. 3 and 4; are sectional views taken on lines 3-3 and 4 -4, Fig. 1.

Fig. 5 is plan view of a pair of rings assembled and contracted as in use on a piston in a cylinder the piston and cylinder not showing. Fig. 6 Fig. 5.

The piston ring consists of two split rings A and B. which are of identical construction. Only one, therefore, will be described in detail.

The ring has a face 1 which is plane (see Fig. i) and a face 2 from which arises the upstanding eccentric rib 3. (See Fig. 1). The outside periphery of the ring is a true circle to conform to the engine cylinder to which it is applied. The inner periphery of the face 1 is a true circle eccentric to the outside periphery. A small tongue 4 projects inwardly a uniform distance around the inner periphery of the ring and corresponds in curvature to the inner periphery of the face 1. The inner periphery for one half the circumference of the face 2 of the ring is formed by the above mentioned small is a sectional view on line 6-6,

tongue Around the other half of the in ner periphery of face 2. projects the upstanding eccentric rib 3.

The outer periphery of the rib 3 formed with the same radius as the inner periphery of the corresponding face of the other ring at the split in order that they may together (as seen in Fig. 5). Obviously the center for the curve of the outer periphery of the rib 3 is slightly above the true center of the rirw. The inner periphery of the upstanding ri 3 is formed on a radius from the true center of the circle. 3 is eccentric. The ring as a whole is also eccentric.

From this construction it will be seen that the ends of the upstandingrib 3 are of substantial thickness and are partly inside and partly overlying the face 2 of the ring, although the rib extends substantially halfway around the circumference of the ring.

This ma..es a stronger and tighter construction than when these ends are formed so that they betome very thin and do not extend as far around the ring.

As the inner periphery of the rib 3 is cocentric, the overhanging part gradually at the thickest portion of the incides with that of the tongue l. base of the upstanding rib 3 and around the outer periphery of such rib is -formed a small groove 5 of the appropriate size to receive the tongue 4 of the other ring.

The ring gradually increases in width from the thinnest portion (which is split at 6 to permit it to be applied to a piston) until the opposing portion 7 is preferably sub stantially double the thickness. The eccentric rib 3 increases in thickness from its ends to a point equidistant from them.

To form a complete piston ring two of the above eccentric rings with their ribs are opposed and fitted together so that the eccentric rib of one engages the inner periphery of the other at the splitand the groove 5 receives the tongue 4 of the other, thus locking the rings together to prevent their separation when in use. It is quite common for two-part rings to and grow in the crack between the rings, thus separating them and causing leakage of gas. This of course cannot occur with my rings which are held together so that foreign material cannot cause them to separate. As the outer curve of the eccentrio Thus the rib I del have dirt or carbon collect the rib has the same radius as the inner periphcry of the opposing ring they fit very ti htly.

he split part of each ring may have a butt .joint, abevel or step split or itmay have a lap joint, though the latter is not necessary with my ring construction as the .engagement of the eccentric rib of one ring with the split part of the other prevents leakage of gas transversely.

By thisconstruction it will be seen that disadvantage of having the thin ends of the ordinary eccentric v ring which often permits leakage of gas is entirely overcome, for when thepair of rings are assembled the are of substantially uniform width an thickness. Yet the advantage of the -more uniform expansion of the eccentric rin is obtained. 7

l hat I claim as my invention is:

1. A piston ring packing consisting of a pair of split rings, each ring having a grooved rib adjacent the inner periphery and extending around substantially half the circumference and each having a tongue adjacent the inner periphery at the split, the curvatures of said tongue and grooved rib being substantially the same.

2. A piston ring packing consisting of a pair of split rings of substantially identical construction, each having an eccentric rib of substantial thickness throughout, said rib lying adjacent the inner periphery and ring at the split.

extending substantially half way around the 'same and having a grooved portion, and a tongue adjacent the inner periphery of the 1?. A piston ring packing consisting of 'a pair ofspht rings each having an eccentric rib with a groove to interlock with the split portion of the other ring, such portion having a tongue formed thereon.

4. A piston ring packing consisting of a pair of eccentric split rings each having an eccentric rib with a groove, and a tongue in the other ring to fit such groove.

' 5. A piston ring packing consisting of a pair of split rings of substantially identical construction, each having a rib with agroove to interlock with the split portion of the other ring, such portion having a tongue fornied thereon, and the rib having a substantial thickness throughout its length.

6. A piston ring packing consisting of a pair of split rings of substantially identical construction, each having a rib with a groove to interlock With the split portion of the other ring, such portion having a tongue firmed thereon, and the rib extending sub stantially half Way around the ring.

7. A piston ring packing consisting of a pair of split rings of substantially identical FRANK F. BESSINGER. 

